Launching an I6 at the track - Page 2

blackers10 · 23-12-2007, 12:11 PM

i figured that the burnout was to help bring up the heat ..

on the street your tyres are warm already due to driving for the last 1/2 hour or so etc etc

i think a burnout for at LEAST your 1st run is always good
coz its fun hehe

after that . do a coupla with and a couple without burnouts etc
see what you like best
its all fun.. thats what the strip is for

EvilChief · 23-12-2007, 12:44 PM

doing a burnout is not only there to warm up the tyres, it is also to clean the surface area (remove old rubber, grime, dust, water, oil etc)

I have been raing for 7 years and warm tyres have always worked better ;)

btw ever ran ur hand over a "hot" tyre vs a "cold" tyre ... see which one is stickier ;)

The Monty · 23-12-2007, 01:04 PM

Thats fair enough. But every run Ive done with a burnout, is always slower then no burnout, its probably to do more with the different compounds in the tyres we all use, no two tyres will be the same.
Also though, do a burnout, and see how high you trans temp goes especially with the auto, and a hot gearbox aint gunna be good for your times.
In saying that though, everyone probably has a different technique, and I think for each persons own combo, you will need to try a few before you find the right one. No two combos will ever react the same way.

Grippy · 23-12-2007, 01:16 PM

Quote:

Originally Posted by EvilChief

doing a burnout is not only there to warm up the tyres, it is also to clean the surface area (remove old rubber, grime, dust, water, oil etc)

I have been raing for 7 years and warm tyres have always worked better ;)

btw ever ran ur hand over a "hot" tyre vs a "cold" tyre ... see which one is stickier ;)

Very true, especially when at Calder with the return road like goat country with loose gravel getting stuck to your tyres, its a good idea to do a little skid to get rid of the crap you pick up after every run.

EvilChief · 23-12-2007, 01:25 PM

Quote:

Originally Posted by The Monty

Thats fair enough. But every run Ive done with a burnout, is always slower then no burnout, its probably to do more with the different compounds in the tyres we all use, no two tyres will be the same.
Also though, do a burnout, and see how high you trans temp goes especially with the auto, and a hot gearbox aint gunna be good for your times.
In saying that though, everyone probably has a different technique, and I think for each persons own combo, you will need to try a few before you find the right one. No two combos will ever react the same way.

correct ...

i never do a 5min burnbout (unlike some ppl i have seen) .. a quick squirt over the water with a quoick post run/launch.

also i am somtimes fortunate enough to run after a big dragster who just left a nice set of very stick tyres marks in front of me. also traction compound used around australia is different all together.

every car anbd every driver requirews a different technicque.

For example launching my Au vs my VP are two completely different hats. each will require a different launch rpm, diferent hook up, brake application etc etc

it all comes down to practice practice practice and more practice. it took me close to 6 months to have my launches optimized on my AU and that was being out there every week practicing.

once my new engine and transmission go into my car it will require a completely different technique once again.

crusher · 23-12-2007, 05:26 PM

Quote:

Originally Posted by JC

Now I know they're different gearboxes and gearsets etc, but V8 Supercars generally only use the clutch pedal to leave the start line and the pits - most drivers don't need a clutch to change gears - especially up, and some (like Greg Murphy) even use no clutch when changing down.[/url]

But dont they also have a cut off switch so when pressure is applied to the gearstick it cuts the throttle and as soon as its changed gear its on again. You can see that when they have the footwell camera and how the right foot doesnt move when the gears change. Theres probably way more involved but basically the gearboxes are designed to be shifted like that and have special stuff built in.

But saying that I know you can shift if you have the revs right etc but it isnt as easy and saying that. Sometimes you can get a fair bit of grinding if you do it wrong....not that I know from experience.....wait yes i do. Tried and failed haha

JC · 23-12-2007, 05:49 PM

Quote:

Originally Posted by crusher

But dont they also have a cut off switch so when pressure is applied to the gearstick it cuts the throttle and as soon as its changed gear its on again. You can see that when they have the footwell camera and how the right foot doesnt move when the gears change. Theres probably way more involved but basically the gearboxes are designed to be shifted like that and have special stuff built in.

But saying that I know you can shift if you have the revs right etc but it isnt as easy and saying that. Sometimes you can get a fair bit of grinding if you do it wrong....not that I know from experience.....wait yes i do. Tried and failed haha

Yes, the supercars do have a "throttle switch" which is why my instructions say to back off the throttle, and do not try Flat changes (well, you can, but it won't work).

FS5 · 23-12-2007, 06:07 PM

i have driven mine without a clutch when the pin pulled out of the clutch fork.it changed gears easy enough as jc is explaining.but i wouldn't like to try for a pb at the track without using the clutch .
on the burnout issue ,i always do a small skid in second just until the tyres dry and hook up.i have tried launching without a burnout a few times in it always wheel spins.
if your having trouble with the wheels spinning the first thing i'd do is let some air out of the tyres.it always pays to take a tyre gauge with you.

**Stav** · 23-12-2007, 08:49 PM

Quote:

Originally Posted by Stav

Joe just give me a call when your going and if I am around Ill come with you.From there well get the best out of the beast.

Ill just tell you now.Firstly despite what people say the track is alot more slippery than what most people state.The entrance to the strip is wet by officials so that you have to through the water.In the water Press the brakes and do a burnout until the tyres grab as it creeps out . In the past I got axle tramp.If the tyres are hotter they stick better.To get a good et you need your best 60 footer.If you have tyres that grip then stage the car.In neutral light rev the cr nd stomp on the brakes.Put the cr into gear and stomp harder on the brakes.Stall that puppy as hard as you can so it will launch as hard as it can. From there on in a few things will happen..you may get massive wheelspin,your tyres may grab and launch you to a great 1/4 mile.If the car tyres grab just keep the pedal to the metal and show no mercy.This is how I get my pb's mate. Performance tyres actually state that they need warming up before performance driving.Cold tyres slip more ..period. Also use your common sense.Some times at wsid half track my car seemed to go a bit sideways at 120 odd kays..just back off and have safety in mind.

One other important thing to note is that trying this on the street is dangerous and illegal.Getting caught by the police is alot easier than killing someone..so dont do it.

stiddy · 23-12-2007, 11:55 PM

Hot tyres always seemed to help me at the track, Stav's right though, road tyres on the race track is slipery compared to road tyres on the road.
Roll up through the water.. DONT stop in the water and do a burnout. Roll out of the water and then stop and turn the bags to smoke. It doesnt need to be huge.. Although I love sitting in 2nd on the limiter with so much smoke you cant breathe just for the crowd lol.
Stav is right about the car getting a little wobbly up at speed about half track.. especially at WSID. Its happened to me a few times.. word of advice if your car starts to kick DONT jump off the throttle, it could end up alot worse.. just ease off the throttle and it will come straight.
Really the only thing you could do is get out there and give it a go see what works for you..

Also for the manual drivers... I wouldnt personally recommend changing without the clutch ive done this a few times.. Im on my 3rd gearbox and 2nd clutch. The pathetic T5's will not tolerate full time abuse.
Launching, sit on the start line, 1st gear clutch in, RPM is at 4000rpm and steady.. side step the clutch but dont increase acceleration until car catchs up to RPM then nail the accelerator, when RPM hits 5800rpm, pull the gear lever out of 1st and when gear leaver reaches nutral pump the clutch and click it into 2nd while accelerator is still firmly buried into the floor. You probably will hit the revlimiter. Takes a bit of practise.
OR
Sit on the line 4000-4500rpm in 1st gear clutch in.. dump the clutch AND lift off the accelerator at the same time (this feels really gay lol) but believe me the car will leap off the line hard but you have to time it right to get the go pedal firmly back on the carpet.

When I finally get back out there with my new box and brass button, im going to try a revlimit dump in 2nd off the line and see how that goes.. I can see half track still smoking but if it hooks up and I dont snap my neck from the Gee's it will be an impressive time lol.

poolkeeper · 24-12-2007, 03:17 PM

Quote:

Originally Posted by Stav

Ill just tell you now.Firstly despite what people say the track is alot more slippery than what most people state.The entrance to the strip is wet by officials so that you have to through the water.In the water Press the brakes and do a burnout until the tyres grab as it creeps out . In the past I got axle tramp.If the tyres are hotter they stick better.To get a good et you need your best 60 footer.If you have tyres that grip then stage the car.In neutral light rev the cr nd stomp on the brakes.Put the cr into gear and stomp harder on the brakes.Stall that puppy as hard as you can so it will launch as hard as it can. From there on in a few things will happen..you may get massive wheelspin,your tyres may grab and launch you to a great 1/4 mile.If the car tyres grab just keep the pedal to the metal and show no mercy.This is how I get my pb's mate. Performance tyres actually state that they need warming up before performance driving.Cold tyres slip more ..period. Also use your common sense.Some times at wsid half track my car seemed to go a bit sideways at 120 odd kays..just back off and have safety in mind.

One other important thing to note is that trying this on the street is dangerous and illegal.Getting caught by the police is alot easier than killing someone..so dont do it.

Ive always thought that the track is slippery on street tyres. I remember watching that video of someone building a gt40 (ford gt) with twin turbo's, and him saying the track is like driving on ice.
I dont go and try 400m, just launching to like 40kph.
Ill call you when Im ready to go though Stav.

superroo · 24-12-2007, 06:35 PM

Quote:

Originally Posted by crusher

But dont they also have a cut off switch so when pressure is applied to the gearstick it cuts the throttle and as soon as its changed gear its on again. You can see that when they have the footwell camera and how the right foot doesnt move when the gears change. Theres probably way more involved but basically the gearboxes are designed to be shifted like that and have special stuff built in.

Can't rember what it's called (force meter or somethings) but when they tug on the gear stick it cuts the spark to the engine, which eliminates the load on the drive train. That and they have sycro-less straight cut gears which make it alot easier to 'flat shift'

Cheers